JPH05311287A - Ferromagnetic cu type shape memory material and its production - Google Patents

Abstract

PURPOSE:To obtain a material having superior magnetic properties and shape memory characteristics by mechanically alloying a mixture of Cu powder and Al powder, mixing the resulting alloy powder body and a Cu-Al-Mn alloy powder body in prescribed ratio, and then sintering the resulting powder mixture. CONSTITUTION:Respective powders of Cu and Al are mixed together with solvent into a composition consisting of, by atomic%, 20-30% and 70-80% Cu, and the resulting mixture is formed into a Cu-Al alloy powder body in a mixed and solid-state-joined state by a mechanical alloying method. Similarly, A Cu-Al- Mn alloy powder body having a composition consisting of 20-30% Al, 20-30% Mn, and 40-60% Cu is prepared. Subsequently, this Cu-Al-Mn alloy powder body is mixed with the above Cu-Al alloy powder body, and the resulting powder mixture is compacted and sintered into a mixed and compacted state, followed by working.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch which has high strength, exhibits ferromagnetism by itself, and has shape memory characteristics.
A magnetic recording material used for controlling industrial machinery, robots, etc. suitable for performing precision microfabrication, assembly, etc., an electrical switching device such as a relay, a temperature sensing sensor, a device in which a control mechanism and an energizing mechanism are integrated. The present invention relates to a ferromagnetic Cu-based shape memory material used for the above.

[0002]

2. Description of the Related Art Conventionally, machining and assembling have been aimed at improving accuracy and cost reduction. However, due to recent demands for miniaturization technology and high functionality, the accuracy and cost reduction are required. The slope to is significantly advanced. In such a situation, as a means to achieve these requirements, the sophistication of the position accuracy function of industrial machines and robots is considered. For that purpose, high performance of position accuracy is required,
Conventionally, a cylinder with a position control function used in this field is stroke-controlled by a combination of a scale on the outer circumference of the cylinder and a detection sensor, but it is difficult to cope with downsizing and cost reduction due to its complicated structure. On the other hand, a mechanical notch type was used to install a magnetic recording scale on the piston rod in the cylinder to simplify the structure, but with this method, the strength of the piston rod is reduced and the magnetic scale is reduced. As a result, there is a lack of magnetic properties.

In addition, since the relay device, which is a type of electric / electronic control device, and the energizing portion of the electric / electronic device have been separately incorporated into the electric / electronic device for use, the size and performance have been improved in recent years. In order to meet the demand, it was desired to integrate these devices with high functionality, but various problems such as current capacity and heat generation are piled up, and it is currently difficult to realize them. is there.

[0004]

In view of the above situation, the present invention provides sufficient quality for the evolution of processing machines, various robots, etc., which are required to have high position accuracy and high size. Ferromagnetism and shape memory that can achieve the miniaturization and high performance of electronic equipment by integrating the electric and electronic control equipment and the energization part of electric and electronic equipment while giving the small and high-performance position control function indispensable to The aim is to develop a material that also has properties.

[0005]

The present invention provides a magnetic recording material for imparting a position control function capable of miniaturization with high accuracy to an industrial machine, robot or the like suitable for performing precision microfabrication and assembly. In addition, as a ferromagnetic material suitable for miniaturization and high performance of electrical and electronic equipment, ferromagnetism is used as a material suitable for miniaturization and high performance of switches, sensors, etc. that switch electrically, magnetically, and temperature. The present invention is to develop a Cu-based shape memory material and a manufacturing method thereof.

That is, the first invention is 20 to 30 at% Al,
Cu-Al alloy powder body consisting of 70-80 at% Cu and A
120 to 30 at%, Mn to 20 to 30 at%, Cu 40 to 6
A ferromagnetic Cu-based shape memory material characterized by being mixed and solidified with a Cu-Al-Mn alloy powder body consisting of 0 at%. The second and third inventions are the above-mentioned first invention. And a pure Cu powder body and a pure Al powder body as Al2.
After mixing with a solvent so as to have a composition of 0 to 30 at% and Cu of 70 to 80 at%, a Cu-Al alloy powder body, a pure Cu powder body, and a pure Al, which were brought into a mixed solid phase bonding state by a mechanical alloying method. 20 to 30 at Al of the powder body and the pure Mn powder body
%, Mn 20 to 30 at%, Cu 40 to 60 at% and a Cu-Al-Mn alloy powder body mixed into a solid phase joined state by a mechanical alloying method after being mixed with a solvent in a predetermined composition. A method of manufacturing a ferromagnetic Cu-based memory material, which comprises mixing in a ratio, pressurizing to solidify, and sintering to make a mixed and consolidated state, and then processing.
A Cu-Al alloy powder body formed by rapidly solidifying an alloy melt consisting of Al 20 to 30 at% and Cu 70 to 80 at%, Al 20 to 30 at%, and Mn 20 to 30 at
%, And Cu-Al-Mn alloy powder body formed by quenching and solidifying an alloy melt composed of 40 to 60 at% Cu, mixed at a predetermined mixing ratio, pressed and solidified, sintered and mixed to consolidate. This is a method for manufacturing a ferromagnetic Cu-based memory material, which is characterized in that it is processed after being brought into a state.

[0007]

First, the reason why the ferromagnetic Cu-based shape memory material of the present invention is constructed as described above will be described. The present invention provides a material having both ferromagnetism and shape memory characteristics by mixing and consolidating a Cu—Al—Mn alloy powder body having ferromagnetism and a Cu—Al alloy powder body having shape memory characteristics. It was done. And, the composition of the Cu-Al-Mn alloy powder body is limited as described above because it is Cu-Al-Mn.
Since the alloy exhibits remarkable ferromagnetism in the composition near the structure having an atomic ratio of Cu ₂ AlMn, it is expressed as at% and Al 20
~ 30at%, Mn20-30at%, Cu40-60at%
Is limited. The composition of the Cu-Al alloy powder body is limited as described above because the Cu-Al alloy is Cu ₃
Since the composition in the vicinity of the structure having an atomic ratio of Al exhibits good shape memory characteristics, it is expressed as at% and Al is 20 to 30 at%,
Cu is limited to 70 to 80 at%.

Cu-Al-Mn alloy powder and Cu-Al
It is preferable that the compounding ratio with the alloy powder body is increased in the former for applications where importance is placed on ferromagnetism, and is increased in the latter for applications where importance is attached to shape memory properties. -Al alloy / Cu-Mn-Al alloy 30/7
It can be changed in the range of 0 to 70/30.

Next, the manufacturing method of the present invention will be described.
It is extremely difficult to manufacture the material of the present invention by ordinary melting and casting, and the inventor has developed the following two manufacturing methods. One of them is to mix pure Cu powder, pure Al powder and pure Mn powder in a predetermined ratio, and mix them with a solvent (stearic acid, ether, etc.) as a binding promoter, and mix the mixture with an attritor or the like. Mechanical energy by kneading in an inert atmosphere such as Ar and applying mechanical energy using a high energy ball mill
ng) to form a Cu-Al-Mn alloy powder,
An Al-Mn alloy powder body, a pure Cu powder, and a Cu-Al alloy powder body mechanically alloyed from a pure Al powder by the same method are mixed at a predetermined mixing ratio, pressurized and solidified, and then sintered. After the mixed and consolidated state is obtained, a ferromagnetic Cu-based shape memory material having a desired shape is obtained by a processing method such as rolling. The pure metal powder used here preferably has a particle size of 100 μm or less.

The other one is Cu, Al in a predetermined mixing ratio,
A molten alloy containing Mn, Cu, or Al is rapidly solidified by an atomizing method or the like to obtain a Cu-Al-Mn alloy powder body and a Cu-Al alloy powder body, and both are mixed at a predetermined mixing ratio. After the mixture is pressed and solidified, it is sintered to be in a mixed and solidified state, and then a ferromagnetic Cu-based shape memory material having a desired shape is formed by a processing method such as rolling.

[0011]

EXAMPLES The present invention will now be described in more detail by way of examples. [Example 1] Pure Cu powder, pure Al powder, and pure Mn powder were blended and mixed so as to have the composition shown in Table 1, and charged into a container of a wet attritor together with stearic acid as a solvent at room temperature. And give mechanical energy by stirring at
₂ A Cu—Al—Mn alloy powder having a composition near MnAl was obtained. In addition, a pure Cu powder and a pure Al powder were used in the same manner to obtain a Cu—Al alloy powder body having a composition near Cu ₃ Al and having a composition shown in Table 1. Both of them were mixed in the mixing ratio shown in Table 1, stirred, and pressure-sintered under the conditions of 700 ° C. and 20 MPa to obtain a plate thickness of 5 mm
After producing the plate material of No. 2, heat the plate material to 350 ° C., and
A plate material having a plate thickness of 4 mm was obtained by 0% rolling, and the magnetic property and the shape memory property were measured by using this as a test material and shown in Table 1. Regarding the magnetic characteristics, the magnetic characteristics were measured using a magnetic sensor, and the output difference from the characteristics of pure copper was shown. Regarding the shape memory characteristics, a plate material having a width of 5 mm was cut out from the test material, heat-treated at 100 ° C. under a restrained condition in which it was bent at a surface angle of 10 °, and then shape memory treatment was performed, and then at −40 ° C. In a low temperature environment, the sample whose shape was restored was heated, and it was examined whether or not the shape was recovered to the matrix phase shape with the face angle of 10 ° C. Those that completely recover are marked with "○", those that show a recovery phenomenon despite being incomplete are marked with "△",
Those that did not recover were judged as x.

[0012]

[Table 1]

As is clear from Table 1, the material of the present invention No. 1
~ No. No. 3 has excellent magnetic characteristics and shape memory characteristics, and it can be understood that a material which is extremely difficult to manufacture can be relatively easily obtained by the melting method as a comparative material. Comparative material No. In No. 4, a sound ingot was not obtained by atmospheric melting casting, and an ingot was obtained by a method of performing degassing treatment in an inert gas atmosphere, but cracks occurred during the subsequent hot working, and the test material Could not be manufactured and the characteristics could not be evaluated.

[0014]

Example 2 A molten alloy having each composition shown in Table 2 was rapidly cooled and solidified by a gas atomizing method using Ar gas to obtain Cu-A.
l alloy powder body and Cu-Al-Mn alloy powder were obtained.
Both were mixed under the same conditions as in Example 1, pressure-molded, and sintered to produce a plate material having a plate thickness of 5 mm. The plate material was heated to 350 ° C. and rolled by 20% to obtain a plate material having a plate thickness of 4 mm. Got
Using this as a test material, magnetic properties were measured in the same manner as in Example 1,
The shape memory characteristics were measured and are also shown in Table 2.

[0015]

[Table 2]

As apparent from Table 2, the material No. 5,
It can be seen that all of 6 have excellent magnetic characteristics and shape memory characteristics.

[0017]

As described above, according to the present invention, it is possible to easily obtain a material having excellent magnetic characteristics and shape memory characteristics, and high performance and miniaturization of industrial machines, robots, etc. It is possible to provide a magnetic recording material having a position control function of the above. Furthermore, by integrating the electric / electronic control device and the electric / electronic device current-carrying part, a material that can achieve miniaturization and high performance of the electronic device can be obtained. It is provided, and has a remarkable industrial effect.

Claims (3)

[Claims] 1. Al 20 to 30 at%, Cu 70 to 80 at
% Cu-Al alloy powder and Al 20-30 at
%, Mn 20 to 30 at% and Cu 40 to 60 at% Cu-Al-Mn alloy powder body in a mixed and consolidated state, a ferromagnetic Cu-based shape memory material. 2. A pure Cu powder body and a pure Al powder body are mixed with Al2.
After mixing with a solvent so as to have a composition of 0 to 30 at% and Cu of 70 to 80 at%, a Cu-Al alloy powder body, a pure Cu powder body, and a pure Al, which were brought into a mixed solid phase bonding state by a mechanical alloying method. 20 to 30 at Al of the powder body and the pure Mn powder body
%, Mn 20 to 30 at%, Cu 40 to 60 at% and a Cu-Al-Mn alloy powder body mixed into a solid phase joint state by a mechanical alloying method after mixing with a solvent in a predetermined composition. A method for manufacturing a ferromagnetic Cu-based memory material, which comprises mixing in a ratio, pressurizing to solidify, and sintering to obtain a mixed and consolidated state, and then processing. 3. Al 20 to 30 at%, Cu 70 to 80 at
%, A Cu-Al alloy powder body formed by quenching and solidifying a molten alloy containing 10% Al, 20 to 30 at% Al, and Mn.
Cu-Al-Mn formed by rapid solidification of molten alloy consisting of 20 to 30 at% and Cu to 60 at%
A method for producing a ferromagnetic Cu-based memory material, which comprises mixing an alloy powder body in a predetermined mixing ratio, pressurizing, solidifying and molding, sintering and mixing to obtain a mixed and consolidated state, and then processing.